Hello Scott, > Hi Marek and Laurent, > > I am working on v4l2 drivers for blackfin which is a no mmu soc. > I found videobuf allocate memory in mmap not reqbuf, so I turn to videobuf2. > But __setup_offsets() use plane offset to fill m.offset, which is > always 0 for single-planar buffer. > So pgoff in get_unmapped_area callback equals 0. > I only found uvc handled get_unmapped_area for no mmu system, but it > manages buffers itself. > I really want videobuf2 to manage buffers. Please give me some advice. I'm not really sure if I know the differences between mmu and no-mmu systems (from the device driver perspective). I assume that you are using videobuf2-vmalloc allocator. Note that memory allocators/managers are well separated from the videobuf2 logic. If it the current one doesn't serve you well you can make your own no-mmu allocator. Later once we identify all differences it might be merged with the standard one or left alone if the merge is not really possible or easy. Best regards -- Marek Szyprowski Samsung Poland R&D Center -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
